[S2 v2.1.0] DateTimePicker : Dojo javascript error

[MLENEVEUT]

Hi all,

I try to insert a datetimepicker tag in my JSP, and I have the following 
javascript error  :
symbol 'struts.widget' is not defined after loading '__package__.js'

here is my JSP :
<%@ taglib uri="/struts-dojo-tags" prefix="sx"%>

<sx:head />
<s:form action="contacts">

<table border="0" width="100%" height="100%">
        <tr>
                <td>
                        <sx:datetimepicker name="dateDeb" label=
"test.datepicker" />
                </td>
        </tr>
</table>

</s:form>

I'm in version 2.1.0-SNAPSHOT (of today) for "core", "codebehind-plugin", 
"dojo-plugin", "sitemesh-plugin", "spring-plugin" and "tiles-plugin" jars.

What's wrong ?

Thanks for your help,

Regards,

Michaël